Math 103 Review 1

The ratio scale of measurement

Is usually based on counting

Has a meaningful zero point

Cannot assume negative values

Usually involves ranking

Two types of statistical variables are

Categorical and numerical

Categorical and descriptive

Descriptive and numerical

You are interested in how stress affects heart rate in humans. Your dependent variable would be the

Humans

Interest

Stress

Heart Rate

Which of the following statements is true regarding a sample

It is a part of population

It refers to descriptive statistics

It must contain at least five observations

All of the above are correct

The ordinal scale of measurement

Has a meaningful zero point

Is based on ranks

Cannot assume negative values

All of the above

Which of the following are examples of continuous variables

Birth weight of babies

Distance between tollbooths on the new jersey turnpike

Age of the CEOs of the Fortune 500 companies

All of the above

Statistical inference

The process of estimations and conclusions carefully based on data from an entire population

Pictorial design that summarizes data

The process of estimation and conclusions carefully based on data from a sample

A qualitative variable

Always refers to a sample

Is not numeric

Has only two possibe outcomes

All of the above are correct

You are conducting a survey of the people of the Philippines to find out how many of them have laptops. You randomly choose to call, and make 1000 phone calls to people scattered across the country. In this study, what is the statistics term for THE PEOPLE IN THE PHILIPPINES, and what is the statistics term for THE PEOPLE YOU CALLED

Both are Populations

Both are Samples

People of the Philippines are the POPULATION, people you called are SAMPLE

People of the Philippines are the SAMPLE, people you called are POPULATION

In descriptive statistics our main objective is to

Compute an average

Infer something about the population

Describe the data we collected

Describe the population

Numerical and pictorial information about variables are called

Analytical statistics

Descriptive statistics

Inferential statistics

Which of these is an example of a categorical variable?

Flavor of a soft drink ordered by each customer at a fast food restaurant

Height measured in inches, for each student in a class

Points scored by each player on a team

Which of the following statements is true regarding a population

It must be a large number of values

It must refer to people

It is a collection of individuals, objects, or measurements

None of the above

Which of the following used inferential statistics

Nine out of ten on-the-job fatalities are men

By 2043 at least 3-5 billion people will run short of water

Expenditures for the cable industry were $5.66 billion in 1996

The median household income for people aged 25-34 is $35,888

You are conducting a study to see whether a new experimental medication will cause bald men to grow hair. You divide the patients into 2 groups. To one group you give the medication. To the other group, you give a placebo. In this study, the correct terrms for aking of the medication and the growth of hair are the following

Medication -independent, hair growth -dependent

Both are independent

Both are dependent

Medication - dependent, hair growth - independent

The science of statistics includes which of the following

Organizing data

Presenting data

Interpreting data

All of the above

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Math 103 Review 1

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